A118409 Unsigned row sums of triangle A118407.

1, 1, 3, 5, 5, 7, 11, 17, 21, 27, 47, 73, 85, 111, 187, 289, 341, 443, 751, 1161, 1365, 1775, 3003, 4641, 5461, 7099, 12015, 18569, 21845, 28399, 48059, 74273, 87381, 113595, 192239, 297097, 349525, 454383, 768955, 1188385, 1398101, 1817531

Offset

0,3

Links

Table of n, a(n) for n=0..41.

Index entries for linear recurrences with constant coefficients, signature (1, 0, 0, 3, -3, 0, 0, 4, -4).

Formula

G.f.: (1+2*x^2+2*x^3-3*x^4+2*x^5-2*x^6)/(1+x^4)/(1-4*x^4)/(1-x).

Prog

(PARI) {a(n)=polcoeff((1+2*x^2+2*x^3-3*x^4+2*x^5-2*x^6)/(1+x^4)/(1-4*x^4)/(1-x+x*O(x^n)), n)}

Crossrefs

Cf. A118407 (triangle), A118408 (row sums).

Sequence in context: A272882 A077800 A073340 * A162779 A158284 A090941

Adjacent sequences: A118406 A118407 A118408 * A118410 A118411 A118412

Keyword

nonn

Author

Paul D. Hanna, Apr 27 2006

Status

approved